291. When contending laws belong to the same category of laws, the more important, or more urgent, or more necessary law prevails.
(a) The law that defends greater goods (those that are spiritual, internal, or common) has precedence over the law that defends lesser goods (the temporal, external, or private). Examples: The natural law that one must save oneself from persecution and death yields to the natural law that one must not blaspheme or deny God, and hence one must prefer to die rather than blaspheme. The law that one may not expose one’s life to danger yields to the law that the common welfare must be defended; hence, citizens are obliged to go to war when the nation calls, pastors and physicians to remain at their posts in time of pestilence, disaster, etc.
(b) Obligations of justice have precedence over obligations of charity, for in the former case a stricter right is in question. Example: Titus is keeping $5.00 in order to pay a debt to Caius, who needs the money today; Balbus, who is very poor, asks Titus to give the money to him. Titus should pay Caius.
(c) Negative or prohibitory laws have precedence over affirmative or preceptive laws (see 371). Example: Titus is asked to write out a testimonial stating that he knows that Balbus is honest, competent, etc. Balbus has claims on the help of Titus on account of a promise made in the past; but Titus knows very well that Balbus is not competent, honest, etc. The law forbidding lies prevails here over the law that one keep a promise made.
292. Since rights and duties are correlative—there being a duty that corresponds to every right, and vice versa—and since both are regulated by law, the principles given for the apparent collision of laws can be applied to the apparent collision of rights.
(a) Rights of a higher kind have preference over rights of a lower kind. Therefore, the rights that arise from birth itself, or from the fact that one is a human being (e.g., the right to life), are superior to the rights that are acquired through some condition, such as inheritance or contract (e.g., the right to property, etc.). Example: Titus must get his child, who is in danger of death, to a hospital without delay. Balbus is getting ready for a pleasure ride, but Titus takes his car since there is no other ready means of getting to the hospital. Titus acts within his natural rights, if the car is returned safely and as soon as possible to the owner. According to civil law his act would be technical larceny, but in view of the necessity courts and juries would certainly not insist on the letter of the law.
(b) Inalienable rights (i.e., those which one may not renounce, because they are also duties), such as the right to serve God, the right to live, etc., are superior to alienable rights (i.e., those which one may renounce), such as the right to marry, the right to own property, etc. Example: One may surrender the right to drink intoxicants in order to serve God or preserve one’s life.
293. The Basis of All Laws.—Prior to every other law and the ground and principle of all laws is the Eternal Law; for, since this is the plan of Divine Wisdom directing from eternity all acts and movements to their particular ends and to the end of the universe, it follows that all other laws are reflections of the eternal plan and realizations of the divine decree. The Eternal Law differs from other laws in various ways:
(a) as to duration. The Eternal Law existed before anything was made, whereas all other laws begin to exist when they are promulgated;
(b) as to breadth of application. The Eternal Law regulates, not only contingent things (such as actions) but also necessary things (such as that man should have a soul, hands and feet); for all things created, whether they be contingent or necessary, are subject to divine government. Human laws, as is evident, cannot regulate what is necessary (e.g., it would be foolish for them to decree that men must or must not have souls);